JEDEC – The propagation time between specified reference points on the input and output voltage waveforms with the output changing from a high-impedance (off) state to either of the defined active levels (high or low).

TI – The propagation time between the specified reference points on the input and output voltage waveforms, with the output changing from the high-impedance (off) state to either of the defined active levels (high or low).

NOTE: Open-collector outputs change only if they are responding to data that would cause the output to go low, so ten = tPHL.